Do you own a professional type scan tool ? Would need to see if the instrument cluster can communicate with scan tool . That would be a priority . If the instrument cluster ,for some reason wouldn't be talking,checking power an ground for the cluster . Batteries going dead , changing batteries without a alternative power supply can cause modules to go to sleep permanently ! Battery Disconnect or Replacement Problems I'am not saying that's what happen to your's . 2003 to 2006 GM had cluster problems ! The solder use in the cluster caused silver migration , instrument cluster caused a drain on the battery overnight . Watch these videos !
Chevrolet Truck Battery Dies Overnight Part II
Chevrolet Truck Battery Dies Overnight Part
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